Test your hardware in the browser
Seven diagnostics for the devices you use every day. No download, no account, and nothing you do here leaves your computer.
Choose a test
Start from the symptom instead
Not sure which test you need? These guides work backwards from what is going wrong.
Keyboard Test
Mouse Test
Dead Pixel Test
Controller Test
Refresh Rate Test
Microphone Test
Speaker Test
Webcam Test
Test a specific model
These pages know which switches your mouse uses and what tends to fail on it.
Why these run in your browser
A hardware fault is a fact about your machine, not about the internet. No amount of reading about dead pixels tells you whether your screen has one. Every test here reads your own device directly through standard browser interfaces, which means there is no upload, no processing on a server, and no account to create.
It also means results are only as good as what a browser can see. Where a test cannot reach something, such as the Fn key on your keyboard or your mouse DPI, we say so on the page rather than inventing a number. More about how we approach this is on the about page.
What that rules out, and what it does not
A passing result does not prove your hardware is healthy, because intermittent faults are intermittent. A failing result does not always mean the hardware is broken, because drivers, cables and settings produce identical symptoms. Each tool's page explains which is which for that device.
Common questions
Do I need to download anything?
No. Every test runs in your browser. There is nothing to install, no account to create, and no extension required.
Is any of this uploaded?
No. Keystrokes, audio, video, controller input and screen test results are all processed on your own device. There is no server receiving them. The microphone and webcam tests ask your browser for permission because the browser requires it, not because anything is being sent anywhere.
Which tests work on a phone?
The screen, microphone, webcam and refresh rate tests all work on mobile. The keyboard test needs a physical keyboard, and the mouse test needs a mouse, so both are desktop only. A controller paired to a phone will usually work.
Can a browser test everything about my hardware?
No, and we say so on each page where it matters. The Fn key on your keyboard never reaches a web page. Mouse DPI is not exposed to any website. Where a browser cannot see something, we tell you rather than guessing at a number.
A test says my hardware is fine but I still have a problem.
That usually means the fault is intermittent, or it is not in the hardware at all. Drivers, operating system settings, cables and USB ports all produce symptoms that look identical to hardware failure. The troubleshooting guides cover those cases for each device.